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Four green DDR5 RDIMM sticks, bare chips, 288 pins each

NEMIX RAM

NEMIX RAM 512GB 4x128GB DDR5 4800 CL40 ECC RDIMM Dell XR7620 memory upgrade

SKU CH-7FN0-ZQ6X5

512 GB of DDR5 ECC registered memory in four 128 GB modules at 4800 MT/s CL40 for Dell PowerEdge XR7620 servers

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 512 GB total capacity across four 128 GB modules
  • DDR5 4800 speed with PC5-38400 bandwidth for server workloads
  • ECC registered design protects data integrity in mission-critical environments
  • 1 V operation reduces power draw per module
  • Validated for Dell PowerEdge XR7620 rack server compatibility

Dell PowerEdge XR7620 compatible kit

This 512GB DDR5 kit delivers 4800 MT/s registered ECC memory for the Dell PowerEdge XR7620 rack server. Four 128GB modules populate the required 288-pin slots with 4Rx4 organisation. The CL40 latency and 1.1V operation match the platform specification. IT teams needing maximum capacity per channel for virtualisation or database workloads can deploy this kit directly.

Thermals noise and power draw

Registered DDR5 modules run at 1.10V without integrated heat spreaders, relying on server chassis airflow for cooling. The lower voltage reduces power draw per module compared with previous DDR generations. In a populated XR7620 the memory subsystem stays within the platform thermal envelope under sustained load. No active cooling or additional fan headers are required for the memory itself.

What the kit changes

The four-module kit provides the full 512GB capacity in a single validated package, eliminating mixed-rank configurations that can limit speed. ECC and registered buffering protect data integrity for mission-critical applications. Modules are stress-tested before shipment to reduce early-life failures. The package contains only the four RDIMMs; no cables, software or additional hardware are included.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $16,388.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $32.01 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineDell Server/Workstation Compatible Series Memory
Model nameDell DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K4
Total capacity512 GB (4 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell
In the box
Included items512 GB (4 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How do I install the 4Rx4 288-pin DDR5 RDIMM modules in the Dell PowerEdge XR7620, and what step is often missed?

Power down the server, open the chassis, align each 128 GB module's notch with the 288-pin slot key, press firmly until the ejector clips lock, then verify all four modules are recognised in the BIOS memory map before closing the case.

What maintenance or replacement will the 512 GB DDR5 ECC registered kit need over its service life?

The modules have no heat spreaders and no moving parts; only periodic dust removal from the DIMM slots and a firmware update if Dell revises memory training code are required.

What limit appears first when the 4800 MT/s CL40 1.1 V kit runs sustained workloads on the XR7620?

The CAS-40 latency at 4800 MT/s becomes the bottleneck before thermal or voltage headroom is reached under continuous load.

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